/*
 * Copyright 2013-2018 Lilinfeng.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 */
package com.phei.netty.protocol.file;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.DefaultFileRegion;
import io.netty.channel.FileRegion;
import io.netty.channel.SimpleChannelInboundHandler;

import java.io.File;
import java.io.RandomAccessFile;

/**
 * @author Administrator
 * @date 2014年3月9日
 * @version 1.0
 */
public class FileServerHandler extends SimpleChannelInboundHandler<String> {

	private static final String CR = System.getProperty("line.separator");

	/*
	 * (non-Javadoc)
	 * 
	 * @see io.netty.channel.SimpleChannelInboundHandler#messageReceived(io.netty .channel.ChannelHandlerContext,
	 * java.lang.Object)
	 */
	public void messageReceived(ChannelHandlerContext ctx, String msg) throws Exception {
		File file = new File(msg);
		if (file.exists()) {
			if (!file.isFile()) {
				ctx.writeAndFlush("Not a file : " + file + CR);
				return;
			}
			ctx.write(file + " " + file.length() + CR);
			RandomAccessFile randomAccessFile = new RandomAccessFile(msg, "r");
			FileRegion region = new DefaultFileRegion(randomAccessFile.getChannel(), 0, randomAccessFile.length());
			ctx.write(region);
			ctx.writeAndFlush(CR);
			randomAccessFile.close();
		} else {
			ctx.writeAndFlush("File not found: " + file + CR);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see io.netty.channel.ChannelHandlerAdapter#exceptionCaught(io.netty.channel .ChannelHandlerContext,
	 * java.lang.Throwable)
	 */
	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
		cause.printStackTrace();
		ctx.close();
	}
}
